/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.adaptive.selection;

import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.adaptive.CatalogEngine;
import com.facebook.presto.spi.adaptive.ConnectorAdaptiveOptimizer;
import com.facebook.presto.spi.adaptive.OptimizerType;
import com.facebook.presto.spi.plan.PlanNode;
import com.facebook.presto.spi.plan.PlanNodeIdAllocator;

import java.util.List;
import java.util.stream.Collectors;

public class RBOAdaptiveSelector
        implements AdaptiveSelector
{

    @Override
    public PlanNode adaptiveSelect(PlanNode newNode,
            ConnectorSession connectorSession,
            PlanNodeIdAllocator idAllocator,
            List<ConnectorAdaptiveOptimizer> connectorAdaptiveOptimizers)
    {
        return newNode;
    }

    /**
     * Filter adptive optimizers according catalog engine and optimizer type.
     * All connectors' adaptive optimizers will be registered,
     * but their optimize types are different, diff selector will use diff optimizers.
     */
    protected List<ConnectorAdaptiveOptimizer> filterAdaptiveOptimizers(
            List<ConnectorAdaptiveOptimizer> connectorAdaptiveOptimizers,
            CatalogEngine catalogEngine,
            OptimizerType type)
    {
        if (connectorAdaptiveOptimizers.isEmpty()) {
            return null;
        }
        return connectorAdaptiveOptimizers.stream()
                .filter(optimizer -> optimizer.getConnectorCatalog().equals(catalogEngine)
                        && optimizer.getOptimizerType().equals(type))
                .collect(Collectors.toList());
    }
}